Dorothea Fou Roseblade, daughter of Holfort Kingdom's prestigious Roseblade family, possesses a striking appearance marked by long blonde hair and blue eyes. Her unapproachable demeanor stems from a habitual cold expression. She favors simple clothing over ornate designs, reflecting minimalist preferences.
Initially aloof and harsh toward strangers, Dorothea reveals contrasting warmth with family and trusted individuals. After marrying Nicks Bartfort, she integrates into the Bartfort household, forming strong bonds—particularly through regular cooking sessions with her mother-in-law Luce. Beneath her noble exterior lies a hidden sadistic streak; she once fantasized about leading suitors on leashes and craved power-struggle marriages, rejecting proposals until meeting Nicks.
Her romantic arc begins when Earl Roseblade arranges a marriage interview with Nicks to secure ties with Leon Fou Bartfort and conceal Dorothea's unconventional tendencies. Unimpressed by Nicks's meekness initially, she becomes intensely attracted when he aggressively declares she should be his "pet." Discovering his insincerity (prompted by Leon), she departs heartbroken. Their relationship mends when Nicks rescues her from pirates, leading to mutual apologies. Under moonlight, Dorothea vulnerably confesses her love, rekindling their connection.
Post-engagement, Dorothea relocates to the Bartfort estate, gaining local popularity. She asserts authority over Nicks's unruly sister Jenna, breaking Jenna's spirit after she insults Nicks. Dorothea's marriage is deeply affectionate, marked by mutual devotion. She encourages Nicks's growth as heir and later becomes pregnant, nearing childbirth during the kingdom's war against the Empire.
In "The Second" route, she marries Nicks after the Offrey and Lafan households' defeat to jointly inherit Offrey domain. In "The Third" route, she shares a casual dinner with Nicks, Leon, and Marie.
Her relationships include a close bond with sister Deirdre, who actively supports her romance. She maintains strict boundaries with brother-in-law Leon, threatening physical retribution for unpermitted contact. Jenna becomes submissive after Dorothea's intervention. Dorothea shares a loving yet occasionally embarrassing dynamic with her overreactive father.
She possesses combat training atypical for nobility—including firearms proficiency—though acknowledging her skills fall below professional soldiers. Pre-Nicks dating involved unconventional power dynamics like collaring partners.